Scott McCormack

- Added new notebook `04-text-byte/04-text-byte.ipynb` from following along with examples in the text (executed using Python 3.10) - Minor updates to `04-text-byte/README.rst` for 2nd Edition updates - Ignore `cafe.txt` (generated...

- Updates to `03-dict-set/03-dict-set.ipynb` to include 2nd edition updates (executed using Python 3.10) - Minor updates to `03-dict-set/README.md` to target script in `03-dict-set/`

- Includes content updates from working through Chapter 03-06